@inproceedings{CTT100599155,
  author = {M. Oikawa and M. Sanada and K. Iga and N. Yamamoto and K. Nishizawa},
  title = {Array of distributed-index planar micro-lenses prepared from ion exchange technique},
  booktitle = {apan. J. of Appl. Phys.},
  year = 1981,
}